Phonograph disk record



April 22, 1930.

E. H. MORRISON PHONOGRAPH DISK RECORD.

Filed Nov. 2, 1928 INVEN TOR.

A TTORNE Y.

iPatented Apr. 22,1930

V UNITED STATES PATENT OFFICE EDGAR H. MORRISON, OF VIRGINIA BELrrronoeaarrr msx niioonn Application filed November 2, 1928. Serial No.816,807.

l graph spindle and the edges of this opening are comparatively soft,being formed in the disk itself, the material of which is not hardenough to withstand wear or rough handling. As, however, in generalusage this opening only serves for centering the disk on the revolvingtable, which communicates the motion to the disk through the soft paddedtop, the said edges are not exposed to a great deal of wear except inthe placing or receiving of a record disk on the table. When, howeverthe records are repeated over and over again on automatic replacingmachines, the strain is very great and as a consequence the opening willsoon be enlarged or still worse, worn more on one side than on' theother. Sometimes actual pockets are formed to one side of the opening sothat it is impossible to properly center the disk again, but moreserious still is thefact that the disks do not properly set or aline onthe supporting arm of the machine and as a consequence of this themachine fails to function.

It is therefore the object of my invention to eliminate thesedisadvantages and to supply record disks with centers that will standconsiderable hard usage. For this purpose I supply a hard, flanged hubor center of any suitable material, such as steel, brass, or the like,and form the disk around the same during manufacture. In this manner Iprovide a disk center that will last the record out without anyappreciable change in the size of the central opening.

For restoring records in which the central opening has already beendistorted, I propose to use hubs with star-shaped ends. In that case theopenin in the diskis restored to circularby insert-mg a temporarycentering piece of the type shown in Figure 6. This device is acylindrical piece of metal having therein and having smooth \orundulated edges, which are then spun, flared, or bent outwardly to griptightly the two faces of the disk The restored -record may then be usedagain for a long time until the sound-producing grooves have been wornout. v

I am aware that clips have; been use'dlfor recoril disks both around theperiphery and in the center thereof, but they are furnished solely forthe purpose of securing two single a record disks together -so as tomake a reversible unit thereof. They are moreover all placed in positionafter the records are finisfhed and not during the manufacture there- Myinvention is illustrated in the accompanying drawing in which-- Figure 1is a face view of a. record disk provided with a hub or bushing formingthe subject matter of the present invention;

Figure 2 a diametrical section of Figure 1;

Figure 3 shows a face view of an ordinary record disk with a worm anddistorted central opening: v

Figure 4 a'similar view showing the disk in Figure 3 bushed and itsopening restored to normal size;

Iiigure 5 a diametrical section of Figure 4:, an

Flgure 6 is a perspective view in larger scale of a reinforcing hubready for insertion in the disk.

In Figures 1 and 2 an ordinary record disk is represented by referencenumeral 10. It is provided with a central opening 12 somewhat largerthanthe opening in a disk of the usual kind. 0 This opening is filled by ametallic sleeve or bushing 11 fitting tightly a flange 13. at each endsunk into the body of the disk 10 so that the exposed sides of theflanges becomei flus h with the side surfaces of the disk. It-w'ill -beevident that with a bushing flanged in this manner, it would beimpractical to, insert it 1 after the record is otherwise finished. I

therefore propose to first supply the hub or bushing 11 having theflanges 13 extending radially from the ends thereof; then formin thedisk around it so that it becomes embedded in the body of the diskduring the process of manufacture when the disk is formed around thehub. A truevcenter is thus provided for the disk with an opening 14'ofthe exact diameter to fit the table spindle of the phonograph. In casethe latter now should be an automatic replacement machine the hookedfinger on the lifting arm cannot possibly destro the roundness of thecentral opening 14 an the usefulness of the record is thus prolongedconsiderably.

In the case of old records that have been already worn so as to have anenlarged, eccentric, central opening 15, as seen in Figure 3 I proposeto use a bushing .16 (see Figure 6 with undulated end edges 17. In suchcases the temporary piece 16 is simply inserted by hand and the prongs17 bent outwardly against the surface of the disk on both sides,- thusgiving the ap earance of. a many-pointed star with the which is of thesame diameter as the spindle on the revolving table of-the machine. Thisconstruction is shown in Figures 4 and 5 where the fingers are indicatedas lying fiat onthe side surfaces 18 of the disk and the annular portionof 'the bushing fits againstthe inner periphery 19' thereof. It is,however, evident that a counter-bore, may be provided on each side asindicated in Figure 2 in which case the star fingers also here goald beflush with the side surfaces of the s Y Instead of using a star-shapedhub or bushing, the flanges may have any other coning adapted to beinserted in the center open- I ing of the disk record for cooperationwith a center spindle comprising a cylindrical body portion having aninternal diameter substantially the size of the center spindle,said'body being provided with prongs at each end adapted to be bent atright angles to. the axis of the cylindrical body into intimate contactwith the opposite side faces of a disk record.

2. In a phonograph record, a circular disk and a hub for said diskforming an insepaagainst the side surfaces 0 rable unit therewith, theinterior diameter of the hub corresponding to that of the phonographspindle, and said hub provided with, radially projecting rongs lyingflat f the disk.

In witness whereof, I have hereunto set my hand at Vir 'nia Beach,Virginia, this 15th day of Octo er, A. D. nineteen hundred andtwenty-eight.

- EDGAR H. MORRISON.

gers spread out radially from the center opening 14

